Printing Macro, not printing monochrome

' A3 Monochrome, No lineweights, Fit All drawing Limits.

Sub main
       
    MbeSetAppVariable "PLOTDLG", "plotAttrUI.line_wghts", 0&
   
    MbeSetAppVariable "PLOTDLG", "plotUI.uiColorMode", 0&
    
    MbeSetScaledAppVar "PLOTDLG", "plotUI.dblScaleUorsToPrintUnits", 1.97
    
    MbeSendCommand "PRINT BOUNDARY FIT ALL "
   
    MbeSendCommand "PRINT EXECUTE "
   
End Sub

The above macro is to print drawings to the default printer.

Prints come out in colour, what am I missing??

(I recorded this with the inbuilt recorder, I am not an expert user or programmer).